How to use this tool
- Choose your file or try the example.
- Run the tool and check the result.
- Save the result where a download is available.
Supported features & limits
Approximate full dichromacy preview using published linear-RGB matrices. It is not a medical test. Image is scaled to at most 1600 px. Maximum 10 MB and 24 megapixels.
What happens to my files?
Your browser reads the file locally. File contents are not sent to our server. Closing or resetting this page clears the working result. Downloaded copies remain on your device.
Maintained by Roman Zmazhenko. Updated 1 November 2026.